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Restructuring And Other Charges (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Person
Jun. 30, 2011
Person
Jun. 30, 2012
Person
Jun. 30, 2011
Person
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges $ 15 $ 34 $ 25 $ 40 $ 130
Restructuring and other charges, after-tax and noncontrolling interests 10 16 17 21  
Number of employees associated with layoff costs 110 120 330 480  
Minimum amount of cash payments expected to be paid beyond the end of the current annual period     45    
Maximum amount of cash payments expected to be paid beyond the end of the current annual period     50    
Alumina
          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges 1 25 1 26  
Number of employees associated with layoff costs 25 20 25 30  
Primary Metals
          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges 1   6 2  
Number of employees associated with layoff costs 10 70 160 70  
Corporate
          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges 13 6 14 7  
Number of employees associated with layoff costs 75   75    
Other miscellaneous charges
          
Restructuring Cost and Reserve [Line Items]          
Restructuring reserve, other adjustment 1 2 (2) 3  
Restructuring reserve, other adjustment, after-tax 1 2 2 3  
Engineered Products And Solutions
          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges   3 3 3  
Number of employees associated with layoff costs     70 30  
Global Rolled Products
          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges     1 2  
Number of employees associated with layoff costs       350  
Lease Termination Costs
          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges 9        
Restructuring and other charges, after-tax and noncontrolling interests 5        
Restructuring reserve, other adjustment     9    
Restructuring reserve, other adjustment, after-tax     5    
Layoff Costs
          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges 6 8 17 13 93
Restructuring and other charges, after-tax and noncontrolling interests 4 4 12 8  
Small Layoff Reserves Related To Prior Periods
          
Restructuring Cost and Reserve [Line Items]          
Restructuring reserve, other adjustment 1 2 (3) 4  
Restructuring reserve, other adjustment, after-tax 1 2 2 3  
Smelter Curtailments
          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges   6 6 8  
Restructuring and other charges, after-tax and noncontrolling interests   4 4 5  
Number of employees associated with layoff costs     150    
Litigation Matter
          
Restructuring Cost and Reserve [Line Items]          
Restructuring and other charges   20      
Restructuring and other charges, after-tax and noncontrolling interests   8      
Restructuring Programs Layoffs 2012
          
Restructuring Cost and Reserve [Line Items]          
Total number of employees already laid off 40,000,000   40,000,000    
Number of positions terminated     330    
Cash payments made against the layoff reserves 1   3    
Restructuring Programs Layoffs 2011
          
Restructuring Cost and Reserve [Line Items]          
Total number of employees already laid off 535,000,000   535,000,000    
Number of positions terminated     1,600    
Cash payments made against the layoff reserves 6   14    
Restructuring Programs Layoffs 2010
          
Restructuring Cost and Reserve [Line Items]          
Total number of employees already laid off 810,000,000   810,000,000    
Number of positions terminated     875    
Cash payments made against the layoff reserves $ 1   $ 2    
Restructuring Programs Layoffs 2009
          
Restructuring Cost and Reserve [Line Items]          
Total number of employees already laid off 5,810,000,000   5,810,000,000    
Number of positions terminated     6,000